Registering a MIME type handler in Mozilla's autoconfig

[ALBANI damiano]

Hello,
I am trying to use the autoconfig feature of Mozilla to register new 
MIME handlers at browser *startup*.
To avoid duplicating code, I am using the logic from 
"chrome://communicator/content/pref/overrideHandler.js", the one used by 
the preferences panel dealing with helper applications.
However, as there's no 'include' or 'import' feature in JavaScript, I 
have to fetch the file and then eval() the code.

I also took the glue code from 
"http://lxr.mozilla.org/seamonkey/source/xpfe/components/prefwindow/resources/content/pref-applications-new.js#106"; 
onwards.

I can successfully create a HandlerOverride object, but any call on the 
setter/getter of this class fails (silently unfortunately). Where could 
this come from ?

What is strange is that this process works in a <script> included in an 
HTML page (though it needs XPConnect privileges).

I know this is a (bad) trick, but as 
"http://bugzilla.mozilla.org/show_bug.cgi?id=190413"; isn't implemented, 
I have no choice.

Follows my code :
//////
function readFile(path)
{
  var ioService = Components.classes["@mozilla.org/network/io-service;1"]
.getService(Components.interfaces.nsIIOService);
  var channel = ioService.newChannel(path, null, null);
  var inputStream = channel.open();
  var sInputStream = 
Components.classes["@mozilla.org/scriptableinputstream;1"]

.createInstance(Components.interfaces.nsIScriptableInputStream);
  sInputStream.init(inputStream);
  return sInputStream.read(sInputStream.available());
}
var gDS = null;
function addMIMEHandler(mime, extension, description, application)
{
  var gRDF = Components.classes["@mozilla.org/rdf/rdf-service;1"]
                       .getService(Components.interfaces.nsIRDFService);
  var fileLocator = 
Components.classes["@mozilla.org/file/directory_service;1"]

.getService(Components.interfaces.nsIProperties);
  var file = fileLocator.get("UMimTyp", Components.interfaces.nsIFile);
  var ioService = Components.classes["@mozilla.org/network/io-service;1"]
.getService(Components.interfaces.nsIIOService);
  var fileHandler = ioService.getProtocolHandler("file")
.QueryInterface(Components.interfaces.nsIFileProtocolHandler);
  gDS = gRDF.GetDataSource(fileHandler.getURLSpecFromFile(file));
  var js_data = 
readFile("chrome://communicator/content/pref/overrideHandler.js");
  eval(js_data);

// works, a 'for ( i in handler )' sees its methods
  var handler = new HandlerOverride(MIME_URI(mime));
// it works, because mUpdateMode isn't accessed through a setter (?)
  handler.mUpdateMode = true;
  handler.mimeType = mime; // !!! stops/fails here !!!
  handler.description = description;
  handler.addExtension(extension);
  handler.appPath = application;
  handler.isEditable = true;
  handler.saveToDisk = false;
  handler.handleInternal = false;
  handler.alwaysAsk = false;
  handler.appDisplayName = application.split(/[\/\\]/).pop();
  handler.buildLinks();
gDS.QueryInterface(Components.interfaces.nsIRDFRemoteDataSource).Flush();
}
Cheers,
--
Damiano
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